Patent US4879091A successfully refreshed from Google Patents.
US4879091A
Expired / Lapsed
US
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Equiaxed dispersion strengthened copper product and process for making same
Assignee: SCM Metal Products Inc
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Filing: 1987-12-14
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Granted: 1989-11-07
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Expires: 2007-12-14
Abstract
Abstract This invention relates to substantially full-dense, near-net shape bodies made of dispersion strengthened copper (D.S.C.) powder and products which are cold formed and/or machined from these bodies, such as resistance welding electrodes. The invention includes processes for manufacturing substantially full-dense, near-net shape, substantially equiaxed bodies from D.S.C. powder.
Inventors
- 👤 Prasan K. Samal
- 👤 Anil V. Nadkarni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:09
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/059; B; B23; B23K; B23K35/00; B23K35/40; B23K35/402
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
A method for making a substantially fully-dense, near net-shape body made of dispersion strengthened copper powder and having a substantially equiaxed grain structure, comprising the steps of: (a) pressing dispersion strengthened copper powder into a green compact; and (b) hot isostatically pressing the compact into said body.
Claim 2
Independent Claim
47 words
A method for making a substantially fully-dense, near net-shape body made of dispersion strengthened copper powder and having a substantially equiaxed grain structure, comprising the steps of: (a) pressing dispersion strengthened copper powder into a green compact; and (b) hot isostatically pressing the compact into said body.
Claim 3
Dependent Claim
19 words
The method of claim 1 comprising the additional step of sintering said compact prior to hot isostatically pressing it.
Claim 4
Dependent Claim
16 words
The method of claim 2 comprising the additional step of re-pressing said compact after sintering it.
Claim 5
Independent Claim
62 words
A method for making a substantially fully-dense, near net-shape body made of dispersion strengthened copper powder and having a substantially equiaxed grain structure, comprising the steps of: (a) pressing dispersion strengthened copper powder into a green compact; (b) sintering the compact in a first atmosphere; (c) re-pressing the sintered compact into said body; and (d) resintering said body in a second atmosphere.
Claim 6
Independent Claim
62 words
A method for making a substantially fully-dense, near net-shape body made of dispersion strengthened copper powder and having a substantially equiaxed grain structure, comprising the steps of: (a) pressing dispersion strengthened copper powder into a green compact; (b) sintering the compact in a first atmosphere; (c) re-pressing the sintered compact into said body; and (d) resintering said body in a second atmosphere.
Claim 7
Dependent Claim
23 words
The method of claim 4 wherein the density of the compact before re-pressing is not more than about 97% of full theoretical density.
Claim 8
Dependent Claim
14 words
The method of claim 4 wherein the first and second atmospheres are the same.
Claim 9
Dependent Claim
13 words
The method of claim 4 wherein the first and second atmospheres are inert.
Claim 10
Dependent Claim
13 words
The method of claim 4 wherein the first and second atmospheres are reducing.
Claim 11
Independent Claim
43 words
A method for making a substantially fully-dense, near net-shape body made of dispersion strengthened copper powder and having a substantially equiaxed grain structure, comprising: (a) pressing dispersion strengthened copper powder into a green compact; and (b) hot pressing the compact into said body.
Claim 12
Independent Claim
43 words
A method for making a substantially fully-dense, near net-shape body made of dispersion strengthened copper powder and having a substantially equiaxed grain structure, comprising: (a) pressing dispersion strengthened copper powder into a green compact; and (b) hot pressing the compact into said body.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |